On the mechanism of NO decomposition on Cu-ZSM-5 catalysts

Z. Schay, Helmut Knözinger, L. Guczi, Borbély G. Páł

Research output: Contribution to journalArticle

39 Citations (Scopus)

Abstract

Decomposition of NO was studied on Cu-ZSM-5 catalysts prepared by solid state ion exchange using CuCl2 (I), CuO (II) and by conventional liquid phase ion exchange with copper acetate (III). There was no difference in the catalytic activity among samples (I), (II) and (III) using the same copper loading. Treatment of the samples in argon, in air or in NO/Ar mixture at 700°C was necessary to develop optimum catalytic activity. Transient kinetic experiments using NO carried out under isothermal conditions, showed overshoots in the N2 and O2 concentration at the front and tail edge, respectively. Fourier transform-infrared studies indicated the formation of oxidized copper sites and adsorbed NO2 species during the NO decomposition. In a proposed mechanism Cu2+(O)(NO)(NO2) intermediate was suggested to play a key role in the NO decomposition.

Original languageEnglish
Pages (from-to)263-271
Number of pages9
JournalApplied Catalysis B: Environmental
Volume18
Issue number3-4
DOIs
Publication statusPublished - Oct 12 1998

Fingerprint

Copper
catalyst
decomposition
copper
Decomposition
Catalysts
Catalyst activity
ion exchange
Ion exchange
Argon
argon
Fourier transform
acetate
Fourier transforms
Acetates
Infrared radiation
kinetics
liquid
Kinetics
Liquids

Keywords

  • FTIR of NO and CO
  • NO decomposition on Cu-ZSM-5
  • Transient kinetic study

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology
  • Environmental Chemistry

Cite this

On the mechanism of NO decomposition on Cu-ZSM-5 catalysts. / Schay, Z.; Knözinger, Helmut; Guczi, L.; Páł, Borbély G.

In: Applied Catalysis B: Environmental, Vol. 18, No. 3-4, 12.10.1998, p. 263-271.

Research output: Contribution to journalArticle

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AB - Decomposition of NO was studied on Cu-ZSM-5 catalysts prepared by solid state ion exchange using CuCl2 (I), CuO (II) and by conventional liquid phase ion exchange with copper acetate (III). There was no difference in the catalytic activity among samples (I), (II) and (III) using the same copper loading. Treatment of the samples in argon, in air or in NO/Ar mixture at 700°C was necessary to develop optimum catalytic activity. Transient kinetic experiments using NO carried out under isothermal conditions, showed overshoots in the N2 and O2 concentration at the front and tail edge, respectively. Fourier transform-infrared studies indicated the formation of oxidized copper sites and adsorbed NO2 species during the NO decomposition. In a proposed mechanism Cu2+(O)(NO)(NO2) intermediate was suggested to play a key role in the NO decomposition.

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